This is addressed by something called the "first sale doctrine", which states that IP holders only have control over the direct sale between themselves and the other party, and cannot exert control over second, third, or later sales.
Tesla, of course, is not obligated to offer their cars for sale in any particular venue. They cannot, however, stop someone else who possesses a Tesla car from offering it for sale either as a private party or through a third-party dealer. This is why you can go to the Ford dealer and leave with a used Honda. Honda didn't give that car to Ford, but it legally came into the dealer's possession through an intermediary, and thus, the Ford dealer has every right to sell it on their own terms.
The difference here is that we're discussing direct physical goods that may contain intellectual property, whereas Netflix and the internet remove the necessity of the physical medium. This is really where our existing technology access laws begin to fall down. They just do not adequately contemplate a world that does not require transactions of hard physical tokens to exchange substantial sums of information. Of course, the very fact that computer networks don't require that is what gives them their power.
>Anyway, the alternative would be worse. If there was no reason to pick one streaming provider over another on the basis of content, one would quickly become a monopoly, which would be bad for both content creators and consumers.
I don't think this makes sense. Just the opposite is true. If everyone could license the content at a reasonable price and show it on their streaming service, the best streaming service in terms of actual quality would be able to win. Under the current regime, if you don't have both the capital and the clout to spend months in secret meetings with the big media companies, your video streaming startup will simply never gain steam at all. It's much better for the competitive landscape if everyone is legally allowed to show the content.